This paper presents a complex design of frequency modulated interrupted continuous wave (FMICW) and frequency-coded pulses (FCP) for detection of aircraft and ship targets. Here, FMICW is used to satisfy requirements ...This paper presents a complex design of frequency modulated interrupted continuous wave (FMICW) and frequency-coded pulses (FCP) for detection of aircraft and ship targets. Here, FMICW is used to satisfy requirements of aircraft detection and FCP is used to satisfy requirements of ship detection for the differences in maneuverability and scatter characteristics of targets and interference background. The design of such a complex waveform for detection of aircraft and ship targets by a HF radar is discussed in detail with different considerations for better performance.展开更多
In this paper,we present a novel ultrashort pulse shaper based on complex-modulated long-period-grating coupler（CM-LPGC）.Temporal rectangular waveform with 2-ps full width at half maximum（FWHM） is obtained by tran...In this paper,we present a novel ultrashort pulse shaper based on complex-modulated long-period-grating coupler（CM-LPGC）.Temporal rectangular waveform with 2-ps full width at half maximum（FWHM） is obtained by transforming the input Gaussian pulse.Tolerances of the CM-LPGC-based shaper to various non-ideal excitation conditions and fabricating errors are investigated.Results confirm that CM-LPGC is stable and suitable for optical pulse shaping operation.展开更多
文摘This paper presents a complex design of frequency modulated interrupted continuous wave (FMICW) and frequency-coded pulses (FCP) for detection of aircraft and ship targets. Here, FMICW is used to satisfy requirements of aircraft detection and FCP is used to satisfy requirements of ship detection for the differences in maneuverability and scatter characteristics of targets and interference background. The design of such a complex waveform for detection of aircraft and ship targets by a HF radar is discussed in detail with different considerations for better performance.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 61007007 and 61101110)the Foundation of Beijing Municipal Committee of CPC Organization Department (Grant No. 2012D005002000001)
文摘In this paper,we present a novel ultrashort pulse shaper based on complex-modulated long-period-grating coupler（CM-LPGC）.Temporal rectangular waveform with 2-ps full width at half maximum（FWHM） is obtained by transforming the input Gaussian pulse.Tolerances of the CM-LPGC-based shaper to various non-ideal excitation conditions and fabricating errors are investigated.Results confirm that CM-LPGC is stable and suitable for optical pulse shaping operation.
